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115 lines
2.3 KiB
Markdown
115 lines
2.3 KiB
Markdown
---
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id: 68cae5b538ff798bbd4da005
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title: "Challenge 67: Email Validator"
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challengeType: 28
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dashedName: challenge-67
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---
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# --description--
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Given a string, determine if it is a valid email address using the following constraints:
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- It must contain exactly one `@` symbol.
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- The local part (before the `@`):
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- Can only contain letters (`a-z`, `A-Z`), digits (`0-9`), dots (`.`), underscores (`_`), or hyphens (`-`).
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- Cannot start or end with a dot.
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- The domain part (after the `@`):
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- Must contain at least one dot.
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- Must end with a dot followed by at least two letters.
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- Neither the local or domain part can have two dots in a row.
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# --hints--
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`validate("a@b.cd")` should return `true`.
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```js
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assert.isTrue(validate("a@b.cd"));
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```
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`validate("hell.-w.rld@example.com")` should return `true`.
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```js
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assert.isTrue(validate("hell.-w.rld@example.com"));
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```
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`validate(".b@sh.rc")` should return `false`.
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```js
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assert.isFalse(validate(".b@sh.rc"));
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```
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`validate("example@test.c0")` should return `false`.
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```js
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assert.isFalse(validate("example@test.c0"));
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```
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`validate("freecodecamp.org")` should return `false`.
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```js
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assert.isFalse(validate("freecodecamp.org"));
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```
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`validate("develop.ment_user@c0D!NG.R.CKS")` should return `true`.
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```js
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assert.isTrue(validate("develop.ment_user@c0D!NG.R.CKS"));
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```
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`validate("hello.@wo.rld")` should return `false`.
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```js
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assert.isFalse(validate("hello.@wo.rld"));
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```
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`validate("hello@world..com")` should return `false`.
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```js
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assert.isFalse(validate("hello@world..com"));
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```
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`validate("develop..ment_user@c0D!NG.R.CKS")` should return `false`.
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```js
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assert.isFalse(validate("develop..ment_user@c0D!NG.R.CKS"));
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```
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`validate("git@commit@push.io")` should return `false`.
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```js
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assert.isFalse(validate("git@commit@push.io"));
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```
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# --seed--
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## --seed-contents--
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```js
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function validate(email) {
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return email;
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}
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```
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# --solutions--
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```js
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function validate(email) {
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if (email.includes('..')) return false;
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const parts = email.split('@');
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if (parts.length !== 2) return false;
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const [local, domain] = parts;
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if (local.startsWith('.') || local.endsWith('.')) return false;
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if (!/^[a-zA-Z0-9._-]+$/.test(local)) return false;
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if (!domain.includes('.')) return false;
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const tld = domain.split('.').pop();
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if (tld.length < 2 || !/^[a-zA-Z]+$/.test(tld)) return false;
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return true;
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}
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```
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